Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "för, R." wg kryterium: Wszystkie pola


Tytuł:
Security improvement for oil and gas pipeline infrastructure
Autorzy:
Małachowski, J.
Gieleta, R.
Powiązania:
https://bibliotekanauki.pl/articles/244151.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
security
simulation
modelling
Opis:
This research has been inspired by security concerns due to the recent increase in the terrorist threat to gas and crude oil transportation around the world, especially in regions that are of significant value for the energy supplies. Computational mechanics methods will be used in this research to apply shock wave analysis for possible damage assessment of the affected pipelines. These methods may be also used for pipelines at power plants (especially nuclear), which are usually placed high on the homeland security priority list. The main goal of this research is focused on establishing effective simulation methodology to study the influence of shock waves (caused by explosion) on pipeline systems (buried, on surface, or underwater) to ensure their security. This study is primarily focused on the behaviour of a pipeline subjected to the shock wave produced by the detonation of highly explosive (HE) materials. The results of this study will primarily allow for analysis of the blast wave propagation and the resulting damage inflicted by the pipeline. Outcomes of this research are important in preventing damage progression of pipelines under the blast loading. This data will also be used to develop improved design guidelines for safer and less vulnerable pipelines. The study allows for determining a type of structure of the high energy absorbing protective system.
Źródło:
Journal of KONES; 2008, 15, 2; 295-300
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Honeycomb compact heat exchanger for compressor interstage cooling
Autorzy:
Michalak, B.
Domański, R.
Powiązania:
https://bibliotekanauki.pl/articles/242261.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
compact heat exchanger
intercooler
interstage cooling
heat
Opis:
The paper presents results of numerical fmite volume analysis of an efficiency of honeycomb compact gas to gas heat exchanger usedfor compressor interstage cooling for aircraft jet engine. The main analysis starts with building geometry followed by the problem description and model discretization leading to the flnal results and summary. Eight cases were created for the basic model and also several more for afinned geometry. The parallel and counter-current flow modes were considered Special emphasis was laid on finding the heat transfer rate, LMTD parameter and temperature distribution. It was found out that a honeycomb structure is almost insensitive for flow arrangement change and that afinned structure assures much higher heat transfer rate. The honeycomb structure is almost insensitive for flow arrangement change while the finned structure turned out to provide a much better heat transfer. The structure is also almost insensitive for a more efficient (i. e. parabolic) fin shape could also increase the heat transfer in the required area. A more accurate mesh should be created to analyse the finned structure and get more reliable results. The honeycomb structure provides apossibility to create the heat transfer process between more then two fluids i. e. three or four.
Źródło:
Journal of KONES; 2009, 16, 2; 315-321
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical system model for acoustics based telematic micro services in iot for transportation setting
Autorzy:
Kannan, J. R.
Rai, A.
Szpytko, J.
Pandya, J. C.
Powiązania:
https://bibliotekanauki.pl/articles/246778.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
telematic micro services
acoustics based internet of things
telematic
smart city
Opis:
Despite the wide adoption of Internet of things (IoT) with several webs standards and cloud technologies, building of city wide IoT based smart city platform for solving transportation problem remains a daunting task. Owing to the dynamic nature of IoT and components of transportation systems, smart city architecture would require development of a scalable, distributed and evolving architecture on the web. With the advancement in autonomous transportation system there is a need for in adaptive telematic system for communicating with other vehicles, sensor nodes etc. As transport, services have special requirements of which are related to the size and type of information to be exchanged between vehicles (vehicle-to-vehicle communication) and the control centre. . By the time the data makes its way to the cloud for analysis, the opportunity to act on it might be gone. Thus handling such huge streams of data on the fly is a daunting task. In the study we present an interoperable swarm, logic based mobile terminals running multimedia micro services based telematic system.
Źródło:
Journal of KONES; 2017, 24, 3; 111-118
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of FEM model for tension and compression test for aluminum alloys samples in order to set materiał data
Autorzy:
Zduniak, B.
Morka, A.
Gieleta, R.
Powiązania:
https://bibliotekanauki.pl/articles/247620.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
numerical analysis
material data
Johnson-Cook model
P A11
FEM
Opis:
The purpose of this paper is to conform an available material data for aluminum alloy material (P A11). This task was filled with the aid of computer modeling techniques, which are based on Finite Element Method (FEM), and our own experimental tests of quasistatic tension/compression material samples. For this kind of research FEM is most commonly used, but there are also other numerical methods that can be applied. The idea of FEM is the division of the given continuous area into a finite number of subareas (finite elements) connected with one another in nodal points and approximation of solution inside the finite elements using interpolation functions and function values in nodes. Numerical analysis was performed with the LS-Dyna commercial software. Reconstruction of conditions of experiment required application of implicit method of numerical integration in time, so called implicit solver. At this stage of work the aluminum alloy P A11 with respect to Johnson-Cook model was researched. A further work for fmding a good material data for WHA, U12A steel for other constitutive models will be performed. A good agreement of the numerical and experimental results is received. Other material data used in modeling, which were not determined by experiment, assumed according to literature sources.
Źródło:
Journal of KONES; 2010, 17, 3; 527-532
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental identification of hyperelastic material parameters for calculations by the finite element method
Autorzy:
Czabanowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/950175.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
finite element method
elastomer
experimental identification
Opis:
Elastomer materials are commonly used in manufacture of parts of machines and vehicles. A numerical analysis of these elements is possible with many calculation methods, however, due to such properties as incompressibility, very often large deformations, non-linear constitutive compounds, friction and contact phenomena, an analysis by the fmite element method turns out to be a very complicated task. The purpose of experimental studies which were carried out was to determine parameters of hyperelastic materials used for production of elastomer tracks for industrial vehicles. Experiments were carried out with rubber test samples of the hardness close to the hardness of materials used for manufacture of rubber tracks, lining of the driving wheels and track rollers. These parameters were determined for models of hyperelastic materials (Mooney-Rivlin) used for calculations. The obtained results were comparedby numer ical calculations with the help of the finite element method with a model sample at identical load conditions for various models of a material including a material of linear properties (of the constant Young's modulus). Obtained results of studies and numerical analyses demonstrate only a limited potential of the use of linear models for hyperelastic materials - this use is possible only at small deformations. Obtained results of measurements and analyses can be used for proper modelling of parts made of elastomer materials.
Źródło:
Journal of KONES; 2010, 17, 1; 87-92
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The method, based on storage simulator and IR – VIS spectroscopy, for predicting the allowable time of storage of biocomponents for CI engines
Autorzy:
Dzięgielewski, W.
Kaźmierczak, U.
Kulczycki, A.
Okniński, R.
Stefanowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/242434.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
fuel
fuel aging
oils
lubrication
biocomponents
Opis:
The paper presents the results of investigations concerning a new method used for predicting the allowable time of storage of biocomponents – FAME. The method was based on laboratory research carried out with the use of a storage tank simulator. The aging process was carried out in the conditions increasing the reaction rate – at high temperature. There are several methods/procedures used for predicting the allowable time of storage of fuels and biocomponents – FAME, but all of them are based on tests at the temperature so high that the mechanism of aging process is different than the one observed in storage tanks. It was assumed that the aging process could be divided into two stages: at the first stage, the aging precursors are created and at the second stage, precursors are converted into the fuel aging products. These products lead to changes in fuel properties. The kinetics of precursor creation determines the rate of all reactions, which lead to the final aging products. It was found that the rate of reaction at the first stage of fuel aging can be effectively increased by an increase in temperature and even relatively high temperature does not change the mechanism of the creation of aging precursors. The method that has been worked out makes it possible to control the mechanism of aging process during quick laboratory tests. The products of aging processes were detected with the use of the IR-VIS spectrometry. The allowable time of storage was determined for several FAME samples on the basis of quick laboratory tests. The results of laboratory quick tests were verified by comparing them with the results of the aging process of FAME in storage tanks. On the basis of the test results, the algorithm of allowable time of FAME storage calculation was worked out.
Źródło:
Journal of KONES; 2016, 23, 1; 115-121
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vision based navigation for satellite docking
Autorzy:
Jacewicz, M.
Głębocki, R.
Powiązania:
https://bibliotekanauki.pl/articles/245809.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
satellite
vision navigation
autonomous docking
satelita
nawigacja wizyjna
autonomiczne dokowanie
Opis:
This article deals with the situation of a space debris or not working satellite in an unidentified pose with respect to the master satellite. Feature based monocular pose estimation vision system was presented. The results of numerical simulation were described. The results of implementation and testing of simulation intended for vision-based navigation applications such as rendezvous of satellites and formation flying is shown. In this document markerless local features based navigation system has been studied. The proposed vision navigation system satellites are able to determine the position and orientation of a target in relation to the coordinate system of the camera. It relates from the time when the satellite is visible as a small object until docking with the chaser. A modified algorithm soft Position Iterations was used to estimate the pose of the target. Visual navigation system uses a single camera. The impact of changes in illumination of the object was analysed. In order to reproduce the space conditions the laboratory stand was built. The developed method was tested experimentally for different scenarios approach satellites to each other. Comparing the ground truth position and orientation and the results obtained with the aim of vision navigation system it is worth nothing to observe accuracy of the developed method. Achieved satisfactory performance of the algorithm.
Źródło:
Journal of KONES; 2017, 24, 1; 189-202
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of turboprop engine parameters for various fuels
Autorzy:
Jakubowski, R.
Ciechanowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/245965.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
aircraft engine
fuel
turboprop engine
silnik lotniczy
paliwo
silnik turbośmigłowy
Opis:
The analysis of work parameters of a turboprop engine fuelled by various fuels was done in the article. The turboprop engine model was presented in the beginning. The main feature of this model is description of the flow in the engine as semi-perfect gas model. By this way, the change of fumes chemical composition influence the gas properties as heat constant and isentropic index are determined. Next energy balance of a compressor and turbine was analysed and turbine pressure drop was evaluated. Finally, engine output power was determined. It was done for selected fuels, which could be applied in the aero engines. The results of analyse were presented in the tables and charts and discussed. Summary of the test results with the results for contemporary applied fuel allows drawing the conclusions about the turboprop engine performance change by various fuel application. Main of them refers to the point that higher combustion heat value of fuel and higher heat constant of fumes cause better engine work conditions By this way the hydrogen seems to be perspective fuel of future, because its combustion heat value is three times JET A-1 and by this way it is possible the engine fuel consumption will be lower.
Źródło:
Journal of KONES; 2017, 24, 1; 203-210
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement methods for determining the parameters of injectors in internal combustion engines
Autorzy:
Grzesik, N.
Zaremba, R.
Powiązania:
https://bibliotekanauki.pl/articles/242709.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
engine
fuel injectors
fuel spray diagnostics
Opis:
The general principle of internal combustion engine operation has not changed since the engine structure was first developed. However, the system of blending the air and fuel into a mixture with the parameters ensuring effective fuel combustion processes has been evolving over the years. In the simplest engines, the fuel-air mixture was produced in the inlet manifold i.e. in the carburettor systems while the more advanced motors were equipped with the system of Single Point Injection (SPI), and further on with the Multi-Point Injection (MP!) where each of the cylinders has its own individual injector. The Multi-Point Injection (MPI) system has evolved into a Gasoline Direct Injection (GDI) system where the injector sprays fuel directly into the combustion chambers. Presently, due to the restrictive regulations governing the issues of exhaust gases ' composition and emissions, manufacturers of the engines used mainly in the automotive industry apply the system of multi-point indirect injection to the intake manifold or the system of direct fuel injection to the combustion chambers. In both systems, these are the injectors dosing precise amounts offuel, which are the most important, and the most accurate elements of the system. The article presents the injectors' macro- and microscopic parameters used for the purpose of the fuel dispersants' technical condition and performance assessment. Additionally, it refers to direct and optical methods of microscopic parameters measurement enabling fuel spray diagnostics.
Źródło:
Journal of KONES; 2014, 21, 4; 153-159
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation of selected explosion parameters for numerical model
Autorzy:
Barnat, W.
Gieleta, R.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/241757.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
IED
improvised explosive device
numerical model
validation
Opis:
The aim of presented work is examination of blast wave, especially incident and reflected wave pressure. Due to many difficulties and complexity of phenomenon a complete study for different charges should be done. In presented paper two cylindrical TNT charges were used, weighting respectively 100 g and 200 g. Pressure wave was examined using original test stand designed and developed on Department of Mechanics and Applied Computer Science. A test steel test plate with 5 mm thickness was equipped with pressure gauge to measure reflected wave. Additionally, the plate was placed on four special electroresistance strain gauges...To measure force Vishay EA-06-120-060LZ strain gauges were used. For amplification of the dynamometers with strain gauges, MS1001 INFEL bridge was used. The system was used to validate the results from reflected wave pressure gauge. Shock wave pressures was measured using a special sensor model 137A21 amd M350B21 made by PCB Piezotronics At specific distance there was also incident wave pressure gauge. In order to fully examine the dynamic response of the plate an accelerometer was used. As a result, pressure versus time and acceleration versus time plots were obtained. The results will be used to validate numerical model of blast wave impact on a plate.
Źródło:
Journal of KONES; 2012, 19, 4; 9-13
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Knowledge management system for marine diesel engine diagnosis
Autorzy:
Charchalis, A.
Pawletko, R.
Powiązania:
https://bibliotekanauki.pl/articles/242163.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
knowledge management system
diagnostic expert system
marine diesel engine diagnosis
Opis:
The paper presents the conception of knowledge management system for a diagnostic expert system. Development of knowledge management system is necessary during the construction of the expert system. The most important reason is that knowledge in this system is not a static whole, but is subject to dynamic growth, is modified and updated. Advantages afforded by the creation of diagnostic systems based on knowledge, such as expert systems, compared to traditional diagnostic systems based on closed algorithms were characterized. The conception of knowledge management system established in the diagnostic work associated with the development of expert system for marine diesel engine diagnosis. The main elements of the developed management system are: dictionary editor, rule editor, knowledge assessment module and import and export module. Knowledge management system is also equipped with an electronic form that is used to obtain knowledge from experts, specialists in diesel engines operation. The article presents the tasks and the performance of individual components of the system. The knowledge management system enables integration within a single frame of both information collected from experts and automatically collected one. A doubtless advantage of expert system is the opportunity of updating and developing the content recorded in the database. Due to this feature, the effectiveness of the system may grow during engine operation and facilitate gaining new experience.
Źródło:
Journal of KONES; 2011, 18, 2; 77-83
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of model for testing of driving properties
Autorzy:
Brabec, P.
Maly, M.
Vozenilek, R.
Powiązania:
https://bibliotekanauki.pl/articles/243366.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
4WS
Four-Wheel Steering
Scale car model
Opis:
Technical University of Liberec prepares a functional car model with a four-wheel steering in a reduced scale (1:5). For years, reduced scale models have been a valuable tool (especially in the aircraft and ship industry) for analyses of properties and experimenting. Consequently, experiments, which would be otherwise unrealistic, can be made, the system functionality can be verified and the impact of slight changes and design modifications can be analysed. All of this within a relatively short period of time and at low costs. The paper presents the application of a reduced scale car model for the 4WS (Four-Wheel Steering) system development and practical assignment necessary for set up. Also shows the use of individual components for functional implementation of this system. The 4WS system pursues the target of enhanced overtaking stability, elimination of positional variances towards its vertical axis, lower sensitivity to side wind, neutral cornering behaviour etc., thus higher active safety. On the basis of results of driving tests of the scale model and after evaluation of parameters of steering behaviour and driving stability, the computer simulation model of the vehicle could be refined. The reduced scale vehicle model, equipped with the respective sensors of quantities and actuating units, allows carrying out driving tests under laboratory conditions, verification and possible optimisation of algorithms for the control of direction steering of the model is presented in the paper.
Źródło:
Journal of KONES; 2007, 14, 3; 109-115
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods for controlling or limiting the development of microorganisms in petroleum products
Autorzy:
Krakowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/244624.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
petroleum products
microbiological contamination
microorganisms
biocides
fuel
oil
Opis:
In the article, review of the literature on the subject currently used methods of controlling or limiting the development of microorganisms in petroleum products was made. The problem of microbial contamination in petroleum products was presented, which is still valid and is becoming more common. In the article, microbiological contaminants present in petroleum products were described. In the following part of the article the various methods of combating microbial contamination in petroleum products, which include physical methods, thermal disinfection and chemical methods were presented. In due to the limited use of physical methods, the article focused on methods widely disseminated. Combating harmful microorganisms using a biocide were described, which due to their harmful effects on beneficial microorganisms and the environment are becoming more and more limited use. Because of their harmful effects on beneficial microorganisms and the environment, their use is becoming more limited. Furthermore, another method of controlling microorganisms during storage of the fuel by means of cleaners that help to eliminate the water, reducing sludge was presented. Apart from the measures to combat microorganisms and additives of cleaning properties, the simplified methods for determining the amount of microorganisms in the fuel using the kits containing the finished substrate suitable for growth of microorganisms are described. These kits allow the monitor the status of microbial petroleum products and thus help prevent many crashes. In the final part of the article authors proposed other ways to control or limit microbial growth are presented. The work conclusions were completed. The most important is that there is a need to develop effective methods of combating microbial contamination of fuels and oils by means of measures environmentally friendly.
Źródło:
Journal of KONES; 2016, 23, 3; 281-288
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of computer based procedure for quantitative evaluation of bus superstructure in type approval
Autorzy:
Nurhadi, I.
Zain, R.
Powiązania:
https://bibliotekanauki.pl/articles/246415.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ECE R66
bus superstructure
rollover test
FEA
quasi-static incremental loading
elastic plastic
Opis:
This paper deals with development of a computer simulation procedure, as a substitute for physical rollover test, to evaluate bus body structure crashworthiness. It is expected that, when completed, this procedure can be proposed to the authority to enhance its current type approval procedure related to crashworthiness which is merely based on qualitative and empirical field experiences without performing real rollover test. This procedure will enable afirmer base for judging the crashworthiness of bus structure. The proposed computer simulation procedure is being developed based on ECE R66 which allows partial bus body structure to be physically tested. In this case, sections of bus super structure built up from at least two bays are used to represent the whole structure. A finite element method computer program capable of dealing with elastic plastic calculation is employed to calculate deflection of a bay structure under incremental quasi-static loading until residual space limit is reached. From the obtained force-deflection curve, the strain energy absorption capacity of the structure will be evaluated if it is large enough to absorb potential energy resulting from rollover test. A bus body superstructure sample from a representative domestic bus manufacturer is used as test cases.
Źródło:
Journal of KONES; 2010, 17, 2; 371-378
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proposal of ecological propulsion for seagoing ships
Autorzy:
Górski, Z.
Ćwilewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/245781.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
natural gas in marine propulsion
dual fuel marine engines
dual fuel marine boilers
Opis:
Exhaust gases from engines of seagoing ships are the serious problem for environment. That is why the discussion in the matter is very important. One of means to minimise harmful substances emission to earth atmosphere is application of „ecological fuel" — natural gas or nuclear energy for ship propulsion. Natural gas is commonly used in onshore applications but is rarely applied in marine propulsion. Heavy Fuel Oil is the basic brand of fuel used onboard ofseagoing ships. Other kinds of fuel e.g. Diesel Oil or gas Oil are used on smaller ships with limited sailing range. The nuclear energy, due to high costs is used only on few types of warships and some icebreakers. A real means for minimising harmful substances in exhaust gases from ships engines is replacement of Heavy Fuel Oil by Natural gas. Nowadays, heavy oil is commonly used due to technical and logistic abilities and conservative attitude of ship owners. The necessity of improvement in the field of environment protection inclines towards wide application of Natural gas as marine fuel. Application power-plant novel type would break the traditionalism in the shipbuilding and the introduction novel generation ofshipping drives.
Źródło:
Journal of KONES; 2009, 16, 3; 121-128
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies